Valve mechanism for internal-combustion engines.



A. T. BROWN. VALVE MECHANISM FOR INTERNAL comsusnom ENGINES. APPLICATION FILED JAN.20, 1908. Patented July 18, 1916.

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WITNESSESz mv TOR 3 1W $4M ATTORNEYS A.T.BROWN. VALVE MEQHANISM FOR INTERNAL COMBUSTION ENGINES.

* APPLICATION FILED 1AN.2 0,i908. ,L193J5Q.

Patented July 18, 1916.

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W ITN 588 ES flbwzt ATTORNEYS tion, respectively,

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ALEXANDER '1. BROWN, OF SYRACUSE, NEW YORK, ASSIGNOR TO THE BROWN-LIFE GEAR comraux, or SYRACUSE, new Yoax,

A CORPORATION OF NEW YORK.

VALVE MECHANISM FOR INTERNAL-COMBUSTION ENGINES.

Application filed January 20', 1908. Serial No. 411,585.

To all whom it may concern 1 Be it known that I, ALEXANDER T. BROWN, of Syracuse, in the county of Onondaga and State of New York, have invented a certain new and useful Valve Mechanism for Internal-Combustion Engines, of which the following is a specification.

My invention relates to valve mechanisms for internal combustion engines, and it aims particularly to provide an arrangement for controlling the inlet and the exhaust of the explosive mixture and residuum of combuswhich is particularly simple in construction and highly 'efiicient in use.

The invention includes the parts and the combination and arrangement of parts to be hereinafter described, and particularly pointed out in the claim.

In describing this invention, reference is had to the accompanying like characters designate corresponding parts in all the views.

Figure 1 is a fragmentary view of the outer end portion of an air-cooled cylinder equipped with one embodiment of my invention, the parts being shown in transverse sectional elevation. Fig. 2 is asimilar view 5 illustrating a modified embodiment of my :at its inner end, and this end of invention. y The invention includes generally, .an engine cylinder having a single opening through the inner end, or head, thereof constituting both an inlet and an exhaust passageway, a single valve controlling said opening and constituting the sole movable means for sealing the end of the cylinder, separate inlet and exhaust to and from the opening, and an auxiliary valve controlling one of said passages, establishing communication between the other and the opening and cooperating with first-named valve. g

vIn the exemplification ofthe invention illustrated, the piston chamber a, of the engine cylinder, is of truncated conoidal shape the cylinder is provided with an axial opemng a leading entirely therethrough' and having an outwardly-flaring wall. This opening is preferably of, maximum diameter, and in the particular structure illustrated, is of approximately one-half of the maximum d1- ameter of the cylind exemplification In the part ic u1ar of the Specification of Letters Yatenh drawmg in which passages lead ng ameter, which is cated in the top of the casing an m the Patented July 18, 1916.

. invention, illustrated in Fig. 1, the valve mechanism 1s a self-contained structure adapted to be secured to, the engine cylinder as a unit, and it comprises a hollow casing "b, preferably cast in one piece, provided with a diagonally-arranged diaphragm c dividing the chamber of the easing into two passages f, g, the upper one of which is in open C0l 1l1l1!llCLtlOIl at one end with a port it in one side wall of the casing, and the other of which is in open communication at one end with a port i in the opposite side wall of the casing. Both of the passages f, g, communicate with a third port 7c in a nipple or boss 1 which projects'from the lower side of the casing, and has an inverted conical shape periphery snugly fitting the openin a, and a broadened beveled edge m providing a valve seat.

.The passageway f communicates with the port 70 through an opening d in diaphragm 0 and through a depending flange e, surroun ing such opening, which terminates a distance from the and forms therewith an annular opening or port 9 at the inner end of passageway g. The port it is designed to communicate with the exhaust of the engineajud the port 5 is designed to communicate with the passageway leading from the carbureter or other suitable explos ve mixture supply. Both the inner wall of the nipple 1 and removed from,

main valve and the auxiliary valve seat against the surface m and both valves have movement toward and from said seatin a direction axial of the cylinder.

The auxiliary valve 11. is provided with a hollow flaring head and with a tubular stem portion fitted to, and flangee, and with a conical stem portion provided with orifices at establishing open communication between the bore of/said stem and the passageway f, and such conical portion of thestem terminates in a tubular stem portion 0 of relatively reduced diguided in an opening 10- flange surrounding said cylindrical part of the stem. The stem projects beyond the end of the stem 0 and 'CZLIIIBS an inverted cup-shaped head 8 between which and the upper wall of the cas-' ing 6, a helical spring t, is interposed which tends to hold the valve seated. A head a is also secured to the outer end of the stem 0 between which and the casing a second spring ais interposed for normally holding the initial the auxiliary valve seated. The head a is preferably located and movable within the ead s. 4

Suitable levers w, proper'relative periods by mechanism associated with the crank shaftot the engine, are respectively engaged with the ends of the stems 0, 1" for depressing the same against the tensions of the springs t, o; the end of the .lever 02 extending through an opening in the head .9 to engage with the end of the stem 0.

As will be understood, when the stem Wis depressed, the valve 9' will be unseated, but the valve 12, will remain seated and will close the inner end 0' passageway g, in consequence of which only the exhaust passageis apparent that an open When the stem 0 1s depressed,

and in initial part of its movement will make contact with the rear face of the valve 7', and during the remainder of its movement will carry the valve 9' alongwith it. The inner end of the passage 9, or port 9 is uncovered when the auxiliary valve is depressed, and the ex-' plosive mixture then rushes into the chamher a and in its passage thereinto contacts with the valve seat 'm and the the same. The contact eflected between the auxiliary valve and the main valve during part of the movement of the former closes the passage through the auxiliary valve and thus cuts-oil communication between the engine chamber and the passageav'f- Although the valve mechanism has been shown and described as a self-contained structure separable as a unit from the engine cylinder, it will be appreciated that the valve casing might .be made integral with the engine cylinder.

In .Fig. 2 is illustrated a modified form of this valve mechanism in which the inlet and exhaust passages 21 and it are arranged on the same side of the boss or nlpple Z ina, operated at the the mam into communication with size for the escape of the stead of on opposite sides as in the construction shown in Fig. l, and the auxiliary valve 72. consists of a hollow cylindrical head entirely open at its top and communicating with the passage f said head being connected to its stem by Webs 7 located near the bottom of the head.

What I claim is The combination of the main body of an engine cylinder, said body being provided with an opening through the head of the cylinder and a self contained valve mechanism comprising a hollow casing provided atits lower end with. a boss for fitting said opening and with an internal nipple extending into the boss forming inner and outer passages located entirely within the casing, said casing extending above said main body and being provided at its upper end above body with a port communicating with the upper end of the inner passage and a. port communicating with the outer passage through a side wall thereof, one port being the main exhaust port of the engine and the other being the main inlet port thereof, the casing being also provided with a port common to said passagesand located at the inner end of said boss, a main valve controlling the common port and seating against the inner end ofsaid boss, a second valve seating against the inner end of said boss and engaging the rear face of the main valve, the second valve having a tubular stem portion slidable within and fitting the nipple and a conical stem portion extending into the port communicating with thenipplc, said conical stem portion having a passage in the side thereof, the passage opening into the last mentioned port, and the main valve being arranged to control the inner end of the passage of the tubular portion of the second valve and also the outer passage and having an axial stem projectmg above the casing, and the inner valve terminating in a stem, and means coacting with the stem and tially asand for the purpose specified;

In testimony whereofi I have hereunto signed my name in the presence of two at- .testing witnesses, at Syracuse, in the county of Onondaga, in the State of New York, this 14th day of January, 1908.

ALEXANDER T. BROWN. Witnesses: S. DAVIS,

E. K. SEEMILLER- v sleeve encircling said 

